Starts at $59,600
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Pros
Cons
What's New for 2025?
The M340i gets a $2k price hike, which is arguably a bargain given that its new 48-volt mild hybrid system delivers 3 more mpg, 4 more hp and 29 more lb-ft of torque. Inside, the latest version of iDrive has an updated user interface that now incorporates some climate-control functions.
2025 3 Series Selector
2025 BMW M340i
FAST FACTS
"Is there such a thing as the perfect sport sedan? The M340i would undoubtedly be part of that conversation, thanks largely to the sublime B58 turbo inline-6 under the hood, which now makes nearly 400 horsepower yet returns well over 30 mpg on the highway. It's magical, for sure, but the rest of the car comes together so well, too, from the intuitive widescreen infotainment module to the refined ride and useful passenger space. It's a beautifully integrated product from the O.G. master of this genre."—Ranked #1 out of 6 Compact Performance Sedans
MotorDonkey's proprietary vehicle data identifies every significant version of each model so that you can compare and decide. Ordered by price from low to high, here are the versions of the 2025 BMW M340i that you need to be aware of, along with our expert analysis and recommendations.
The B58 turbocharged inline-6 is a magical engine, as BMW geeks are well aware. In our experience, the EPA's fuel economy estimates are quite conservative when it comes to this engine, so you can expect highway efficiency of well over 30 mpg along with otherworldly acceleration. Who needs the M3, right? The B58 makes it a real question.
That's not a typo — the all-wheel-drive M340i gets the exact same fuel economy as the rear-wheel-drive version, per the EPA. How does BMW do it? The B58 turbo six is an incredible engine, for one thing, but there's all sorts of sorcery going on inside this powertrain. Top-notch engineering from the Bavarians here.
Publisher and Donkey-in-Chief
Josh has been reviewing cars professionally since joining Edmunds.com fresh out of grad school in 2008, personally driving most new cars on the market every year since. He also served as the project manager for Edmunds' expert vehicle rankings from their inception in 2018, building the product out from the back end to the front end. Josh is a card-carrying member of the Motor Press Guild and a lifelong car nut who has tested, compared and critiqued a ridiculous number of cars in his career.
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